Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B61—RAILWAYS
  • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
  • B61L25/00—Recording or indicating positions or identities of vehicles or trains or setting of track apparatus
  • B61L25/02—Indicating or recording positions or identities of vehicles or trains
  • B61L25/04—Indicating or recording train identities
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B61—RAILWAYS
  • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
  • B61L25/00—Recording or indicating positions or identities of vehicles or trains or setting of track apparatus
  • B61L25/02—Indicating or recording positions or identities of vehicles or trains
  • B61L25/04—Indicating or recording train identities
  • B61L25/045—Indicating or recording train identities using reradiating tags
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
  • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
  • G01S13/82—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein continuous-type signals are transmitted
• • G—PHYSICS
  • G08—SIGNALLING
  • G08G—TRAFFIC CONTROL SYSTEMS
  • G08G1/00—Traffic control systems for road vehicles
  • G08G1/01—Detecting movement of traffic to be counted or controlled
  • G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04Q—SELECTING
  • H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
  • H04Q9/08—Calling by using continuous AC
  • H04Q9/12—Calling by using continuous AC using combinations of frequencies

Landscapes

• Engineering & Computer Science (AREA)
• Radar, Positioning & Navigation (AREA)
• Remote Sensing (AREA)
• Mechanical Engineering (AREA)
• Computer Networks & Wireless Communication (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Traffic Control Systems (AREA)
• Selective Calling Equipment (AREA)
• Near-Field Transmission Systems (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=20261770

Family Applications (1)

Country Status (7)

Families Citing this family (2)

• 1972
  • 1972-03-15 SE SE327972A patent/SE388101B/xx unknown
• 1973
  • 1973-03-07 DE DE19732311948 patent/DE2311948A1/de active Pending
  • 1973-03-08 NL NL7303279A patent/NL7303279A/xx not_active Application Discontinuation
  • 1973-03-09 GB GB1160473A patent/GB1431303A/en not_active Expired
  • 1973-03-14 DK DK138173A patent/DK134730B/da unknown
  • 1973-03-14 FR FR7309177A patent/FR2176067A1/fr not_active Withdrawn
  • 1973-03-14 NO NO101873A patent/NO137253C/no unknown

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